Form or mold for concrete roof for a silo.



A. A. BIELENBERG.

FORM OR MOLD FOR CONCRETE ROOF FOR A SILO.

APPLICATION FILED FEB. 9,1914.

Patented Jan. 12, 1915.

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ALF HE D A. BIELENBERG, OF ELGIN, ILLINOIS.

FORM B MOLD FOR CONCRETE ROOF FOR A SILO.

Specification of Letters Patent.

Patented Jan. 12, 1915.

Application filed. February 9, 1914. Serial 110.81%430.

To all whom it may concern:

Be it known that I, ALFRED A. BIELEN- BERG, citizen of the United States, residing at Elgin, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in a Form or Mold for Concrete Roof for a Silo, of which the fol lowing is a specification.

My present invention has relation to the production of a form or mold for casting a concrete roof for a silo.

The general practice is to construct $1108 in cylindrical form, and the provision of a' roof for a structure of such a form involvesthe solution of problems which results in the roof being by far the most difiicult portion of the structure.

The objects of my invention are, first, to provide a form or mold for molding or casting a silo roof from concrete which form or mold may be substantially removed after the concrete has set and hardened, and which may be used repeatedly in the casting of other roofs; second, to so construct such a form or mold that it will accommodate itself to variations in dimensions which occur in the construction of the silo walls; and, third, the provision of such a form or mold which will secure a silo roof of maximum strength for the volume and weight of concrete used.

T. attain the above objects by means of the structure illustrated in the accompanying drawing, in which Figure 1 is a section upon a radius of a form in position for casting a roof; Fig. 9. is a plan of my form; Fig. 3 is an elevation of my form; Fig. 4 is a sectional detail on line 44: of Fig. 1; Fig. 5 is a perspective of one of the radial convex bottom members of the form; and Fig. 6 is an elevation of one of the angle iron brackets.

Similar reference characters refer to similar parts throughout the several views.

The mold or form structure is held in position with relation to the Walls of the silo by means of the straps, 1, which extend over the top of the silo wall, designated by the numeral 2, and down and adjacent both the outside and inside thereof. The outer end is bent outwardly at substantially right angles and bolted by means of the bolt 3, to the outwardly bent portion is the annular horizontally extending plate, 4, which forms the bottom of a form for the cornice which is cast or molded integral with the roof.

Riveted or bolted to the strap, 1, where it extends/across the top of the silo wall is an outwardly extending piece of angle iron orbrace, 5, to the outer end of which and to the'edge of the annular horizontal plate, 4, is bolted by means of the bolt, 5 the vertically annular plate, 6, which forms the outer wall for the form' for the cornice. .The

form may be removed from about the cornice by removing the nuts from the bolts 3 and5 which leaves the straps 1 and angle pieces 5 embedded in the structure and con stituting valuable reinforcement therefor.

To the lower end of the strap, 1, which extends adjacent the inner face of the silo wall is detachably secured'by a bolt, 7, an

angle iron bracket, 8, as shown in Fig. 6.

The center of the form is a cylindrical piece of sheet metal, 9, circumferentially around which is riveted a piece of channel iron, 10. Below the channel iron, 10, and spaced at suitable intervals are bolted by means of the bolts, 11, a series of the angle iron brackets, 8.

The straps, 1, are spaced about the silo wall opposite and to correspond with the angle iron brackets upon the cylindrical member, 9, and extending between the angle iron brackets upon the straps, 1, and the cylindrical member, 9, with their upper ends entering the channel, 10, are pieces of angle iron, 12, the angle iron bracket serving to locate these pieces in proper position. Extending radially between the walls of the silo and the central cylindrical member, 9, with their lateral edges resting in the angle of adjacent angle irons, 12, are the convex floor sections, 13, shown in perspective in Fig. 5. It will now be seen that such differences in diameter as are likely to occur can be taken up by a difference in slant of the pieces 12 and 13, and differences in circumference or area in the roof can easily be taken care of by a change in convexity of the pieces, 18, which can readily be secured without tools.

The central cylindrical member, 9, remains in the completed roof and serves as a convenient member over or in which a ventilator cap may be mounted.

A filling opening or dormer is secured by providing upon the vertical annular plate, 6, an upwardly extending projection, 14, opposite which is a convex dormer roof piece, 15, similar to the pieces, 13, but larger.

After the concrete has been put into the mold and has set and hardened sufl'iciently,

the angle iron brackets, 8, the angle irons, 12, and the convex floor sections, 13, may be removed by removing the nuts from the bolts 7 and 11, and may be employed in the molding or casting of other roofs.

Having described my invention what I claim as new and desire to secure by Letters Patent is l. A form for a silo roof comprising straps adapted to extend over and down upon the sides of a silo wall, a central cylindrical member, a channel circumferentially disposed upon the same, brackets for the inner end of said straps, corresponding brackets upon said central member, angle pieces extending between said corresponding brackets and convex pieces extending radially between said straps and said central members and having their lateral edges in the angles of said angle pieces.

2. A form for a silo roof comprising wall straps, a central member, brackets upon said straps and corresponding brackets upon said central member, angle irons extending radially between said brackets and convex radially extending pieces having their lateral edges in the angles of said irons.

3. A form for a silo roof comprising wall straps, a central member, removable brackets upon said straps and corresponding removable brackets upon said central member, angle irons extending radially between said braokets and convex radially extending pieces having their lateral edges in the angles of said irons.

4. A form or mold for a silo roof comprising straps for engaging the silo walls, a central member, detachable brackets upon said straps and said central member, angle irons extending between said detachable brackets, and fioor members having their lateral edges in the angle of said angle irons.

5. A form or mold for a silo roof comprising straps for engaging the silo walls, a cen tral member, detachable brackets upon said wall brackets and said central member, and floor members extending between said detachable brackets.

In testimony whereof I aflix my signature in the presence of two witnesses.

ALFRED A. BIELENBERG.

Witnesses BENJ. T. ROODI-IOUSE, HATTIE B. LEHMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 2D. 0. 

